A fortified enclosure from the 13th to the 14th century, no doubt built on the remains of a first building from the 8th century, the castrum has belonged since 1232 to the powerful Baux family. It is inside this "Castrum" that the medieval Cassis developed, which sought to protect itself from barbarian invasions and brigands. At the end of the 15th century, this fortress housed more than 250 inhabitants. Stormed in 1524 by the troops of Charles V, the Citadel will then be gradually abandoned in favor of the town on the edge of the shore and will become a military fort. In 1794, the young General Bonaparte stopped at the castle to inspect the military batteries which were destroyed by the English in 1813. Sold by the administration of the domains in 1896 to a tobacconist from Saint Cyr then resold several times, the castle was since then a private property, converted into luxury guest rooms.